Epson FX-870/1170 User Manual Page 54
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- Table of contents
- TROUBLESHOOTING
- BOOKMARKS
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Troubleshooting 3
The information in this section can help you identify causes of printer problems and test the
printer to isolate the part that needs to be replaced. The chapter also contains illustrations
showing connector locations and sensor locations. Once you have read this chapter to
determine what tests you need to run on the printer, see Chapter 4 for instructions on how to
disassemble the printer.
WARNING
Before disassembling the printer to perform any troubleshooting tests, disconnect the
power supply cable from the AC power outlet. Failure to do so may cause physical injury.
The power switch is wired in the secondary circuitry. Therefore, the printer’s primary
circuitry remains live even after the power switch is turned off.
When performing the testing described in this chapter, do not connect the printer to the
power source unless instructed to do so in the test. When the power supply must be
connected, use extreme caution, because the voltage may cause physical injury and may
, damage the components of the printer.
Test Points
The test point tables and diagrams have been placed at the front of this chapter to provide you
with
a
quick reference for checking motors, the printhead, printhead drivers, sensors, and the
power supply, if you suspect a problem.
Table 3-1. Power Supply Test Points
Gower
Supply
Connector
Pin Numbers
11 and3
(CW
Power Supply
Connector
Pin Numbers
1 and3
VW
9and3
CN2
Test Method
(Set Meter to Continuity.
Check with Printer Power Off.)
Place one lead on pin 11 and the other on
pin 3 (ground).
Test Method
(Set Meter to Volts.
Check with Printer Power On.)
Place the + lead on pin 1 (5 V) and the
-
lead on pin 3 (ground).
Place the + lead on pin 9 (35 V) and the
-
lead on pin 3 (ground).
Meter Reading
Continuity/open means OPERATE is activated
and you can check the power supply voltages.
Meter Reading
+5
v
+35
v
Epson
FX-870/1170
3-1
- FX-870/1170 1
- FCC Compliance Statement 2
- Copyright Notice 3
- Trademarks 3
- Precautions 4
- How to Use this Manual 5
- EptmnFX-870/1170 6
- Numbers and Addresses 7
- Contents 8
- Removing the Panel Unit 9
- Printer Features 10
- List of Figures 11
- List of Tables 11
- 80-column model 14
- 136-column model 14
- Hardware Specifications 15
- FX-8700170 20
- 0.12” (3.0 mm) or more 22
- EpsonFX-870/1170 22
- Epson FX-8700170 24
- Interfaces 25
- Control Panel 29
- Default Settings 32
- Position 1 (3rd step) 37
- Printer Initialization 38
- Table 1-21. Buzzer Functions 39
- Main Components 40
- ,,DAld-lfil-l 41
- Epson FX-87011170 42
- Housing Assembly 44
- Chapter 2 48
- Site Requirements 49
- The Correct Power On Sequence 49
- Parallel Cables 50
- Serial Cables 50
- Serial Cable 51
- Tips to Increase Printer Life 52
- Troubleshooting 53
- Troubleshooting 3 54
- Table 3-2. Sensor Test Points 55
- Error Codes 58
- Problem Isolation 59
- Serial Communications Errors 60
- Possible Cause 61
- 3-10 Epson 63
- Self-Test 66
- Chart 6. Data 68
- Host is Printed Incorrectly 68
- FX-870/i 70
- Connector Locations 71
- Sensor Locations 72
- Figure 3-5. Platen Gap Sensor 73
- Disassembly and Assembly 78
- Disassembly and Assembly 4 80
- Service Checks After Repair 81
- Screw Specifications 82
- Removing the Printhead 86
- Removing the 87
- Insertion 93
- Printer Mechanism 97
- Arranging the Cables 100
- Disassembly 103
- Assembly 103
- Epson FX-870/1170 103
- Adjustments, Maintenance, and 105
- Lubrication 105
- Platen Gap Adjustment 106
- Preventive Maintenance 110
- Table 5-2. Lubrication Points 111
- Principles of Operation 113
- Carriage Mechanism 118
- Paper Handling Mechanisms 120
- Ribbon Advance Mechanism 133
- Power Supply Operation 134
- Pfinciples of Operation 135
- Secondary 136
- Control Circuit Operation 137
- E05A66YA (IC4) 139
- FX-87W1170 139
- Sensor Circuits 141
- Carriage Motor Drive Circuit 142
- Printhead Drive Circuit 144
- Parallel Interface Circuit 144
- PROM Control Circuit 145
- CH1=50V TIME=2ps 146
- Reference Materials 153
- Reference Materials 7 154
- Circuit Diagrams 158
- Circuit Diagram 159
- C076 PSB Power Supply Board 160
- CO76 PSB Power Supply Board 161
- Figure 7-6 162
- Figure 7-7 163
- Outline Drawings 166
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